I recently put in a crower st. 2 cam and springs/retainers on my d16y8 99 civic ex. the power is sluggish below 3 k (about the same as stock) but after 3 k the power gains were tremenous. The tires easily break loose on turns at high rpms. The car was a biatch to get idling correctly though. major timing issues, you just have to play with it to get it right (and the idle screw). 2 thumbs up.